DR-1X Fusion Repeater to PI 3 Using an RA-40 Control Interface
Allstar [Asterisk] software was installed on the PI 3. It was discovered to be the most advanced package, and user friendly.
Within it is the correct control package to operate the PTT function through the RA-40 control board interface on pin 13.
The package offers Echolink, and Allstar directly with a Linux OS from
one download for the PI 3 [32 GB micro SD uses 4 GB]
Engineering Section - Hardware and Cabling
RA-40 Repeater Control Interface Board
Green HB = Heartbeat indicates PI/3 is talking to the RA-40 control board
Blue Com OK = Heartbeat Timmer Pi is Up
Red PTT = Push to Talk indicates Repeater is transmitting
Voice Level = Left audio channel USB => Transmit audio to Repeater
Mic Level = Audio input to USB <= Recieve Audio from Repeater
JU1 Local / Remote Mode Polarity Lo = Remote mode [set to A]
JU2 5v to 12v Audio Power amp Selection Set to 12v [set to B]
RA-40 Circuit Diagram
Custom Cable 9 pin Dsub on RA-40 to HD15 pin Control Port on DR-1X Repeater
This cable uses 8 conductor shielded wire for a total of 9
conductors. One each 9 pin D-sub male and one each HD15 male 15
pin 3 row VGA style D-sub.